<template>
  <!-- 窗口侧边栏 -->
  <!-- 商品分类导航 -->
  <div class="typeNav">
    <div class="container">
      <div @mouseleave="leaveShow" @mouseenter="enterShow">
        <h2 class="all">全部商品分类</h2>
        <transition name="sort">
          <div class="sort" v-show="show">
            <div
              @click="goSearch"
              class="item"
              v-for="(c1, index) in categoryList"
              :key="c1.categoryId"
            >
              <h3
                :class="{ cur: currentIndex == index }"
                @mouseenter="changeIndex(index)"
              >
                <a
                  :data-categoryname="c1.categoryName"
                  :data-category1id="c1.categoryId"
                  >{{ c1.categoryName }}</a
                >
              </h3>
              <div
                class="item-list clearfix"
                :style="{ display: currentIndex == index ? 'block' : 'none' }"
              >
                <div class="subitem">
                  <dl
                    class="fore"
                    v-for="c2 in c1.categoryChild"
                    :key="c2.categoryId"
                  >
                    <dt>
                      <a
                        :data-categoryname="c2.categoryName"
                        :data-category2id="c2.categoryId"
                        >{{ c2.categoryName }}</a
                      >
                    </dt>
                    <dd>
                      <em v-for="c3 in c2.categoryChild" :key="c3.categoryId">
                        <a
                          :data-categoryname="c3.categoryName"
                          :data-category3id="c3.categoryId"
                          >{{ c3.categoryName }}</a
                        >
                      </em>
                    </dd>
                  </dl>
                </div>
              </div>
            </div>
          </div>
        </transition>
      </div>

      <nav class="nav">
        <a href="###">服装城</a>
        <a href="###">美妆馆</a>
        <a href="###">尚品汇超市</a>
        <a href="###">全球购</a>
        <a href="###">闪购</a>
        <a href="###">团购</a>
        <a href="###">有趣</a>
        <a href="###">秒杀</a>
      </nav>
    </div>
  </div>
</template>

<script>
import { mapState } from "vuex";
export default {
  name: "TypeNav",

  data() {
    return {
      show: true,
      currentIndex: -1,
    };
  },
  computed: {
    //state:他是咱们大仓库中的state（包含home|search）
    ...mapState("home", ["categoryList"]),
  },
  mounted() {
    if (this.$route.path != "/home") {
      this.show = false;
    }
  },

  methods: {
    goSearch(e) {
      let { categoryname, category1id, category2id, category3id } =
        e.target.dataset;
      console.log(e.target.dataset);
      if (categoryname) {
        //准备路由跳转的参数对象
        let location = {
          name: "search",
        };
        //第二个问题解决了：点击的到底是不是a标签（只要这个标签身上带有categoryname）一定是a标签
        //当前这个if语句：一定是a标签才会进入
        let query = { categoryName: categoryname };
        if (category1id) {
          query.category1Id = category1id;
        } else if (category2id) {
          query.category2Id = category2id;
        } else {
          query.category3Id = category3id;
        }
        console.log(query);

        if (this.$route.params) {
          location.params = this.$route.params;
        }
        location.query = query;
        this.$router.push(location);
      }
    },
    changeIndex(index) {
      //修改当前currentIndex索引值
      //函数节流:在20MS时间之内只能执行一次
      this.currentIndex = index;
    },
    enterShow() {
      if (this.$route.path != "/home") {
        this.show = true;
      }
    },
    //当鼠标离开的时候，让商品分类列表进行隐藏
    leaveShow() {
      this.currentIndex = -1;
      //判断如果是Search路由组件的时候才会执行
      if (this.$route.path != "/home") {
        this.show = false;
      }
    },
  },
};
</script>

<style lang="scss" scoped>
.typeNav {
  border-bottom: 2px solid #e1251b;
}
.container {
  line-height: 45px;
  height: 45px;
  display: flex;
  position: relative;
  .all {
    width: 210px;

    background-color: #e1251b;

    text-align: center;
    color: #fff;
    font-size: 14px;
    font-weight: bold;
  }
  .nav {
    a {
      margin: 0 22px;

      font-size: 16px;
      color: #333;
    }
  }
  .sort {
    position: absolute;
    left: 0;
    top: 45px;
    width: 210px;
    height: 461px;
    position: absolute;
    background: #fafafa;
    z-index: 999;

    .item {
      h3 {
        line-height: 30px;
        font-size: 14px;
        font-weight: 400;
        position: relative;
        cursor: pointer;

        &:after {
          position: absolute;
          right: 0;
          top: 5px;
          width: 10px;
          height: 15px;
          content: " ";
          display: inline-block;
          background: url(~@/assets/images/icon-arrow.png) no-repeat center;
          background-size: contain;
        }
        &.cur {
          background: skyblue;
        }
        a {
          padding-left: 10px;
          color: #333;
        }
      }
    }
    .item-list {
      display: none;
      position: absolute;
      width: 734px;
      min-height: 460px;
      background: #f7f7f7;
      left: 210px;
      border: 1px solid #ddd;
      top: 0;
      z-index: 9999 !important;
      .subitem {
        float: left;
        width: 650px;
        padding: 0 4px 0 8px;

        dl {
          border-top: 1px solid #eee;
          padding: 6px 0;
          overflow: hidden;

          dt {
            cursor: pointer;
            float: left;
            width: 54px;
            line-height: 22px;
            text-align: right;
            padding: 3px 6px 0 0;
            font-weight: 700;
          }

          dd {
            cursor: pointer;
            padding: 3px 0 0;
            overflow: hidden;

            em {
              float: left;
              height: 14px;
              line-height: 14px;
              padding: 0 8px;
              margin-top: 5px;
              border-left: 1px solid #ccc;
            }
          }
        }
      }
    }
    //过渡动画的样式
    //过渡动画开始状态（进入）
  }
  .sort-enter,
  .sort-leave-to {
    height: 0px;
  }
  // 过渡动画结束状态（进入）
  .sort-enter-to,
  .sort-leave {
    height: 461px;
  }
  .sort-enter-active,
  .sort-leave-active {
    transition: all 0.5s linear;
  }
}
</style>
